Auto merge of #49753 - kennytm:rollup, r=kennytm

Rollup of 9 pull requests

Successful merges:

 - #49510 (Fix anchor position on fields)
 - #49652 (Fix anchors issue when everything is collapsed)
 - #49702 (std: Inline some Termination-related methods)
 - #49728 (add emit_debug_gdb_scripts target option and ..)
 - #49731 (add THUMB targets to rustup manifest)
 - #49742 (Using X headings instead of 0.X #49739)
 - #49748 (proc_macro: Improve Debug representations)
 - #49750 (bootstrap: Remove the fast path)
 - #49503 (Inject the `compiler_builtins` crate whenever the `core` crate is injected)

Failed merges: